Sonochemical-Assisted Synthesis of Copper Oxide Nanoparticles and Its Application as Humidity Sensor

Document Type : Research Paper


1 Institute of Nano Science and Nano Technology, University of Kashan, Kashan, P.O. Box 87317-51167, I. R. Iran

2 Department of Physics, Faculty of Science, Arak University, Arak 38156-88349, Iran



Cupric oxide nanostructures were synthesized via a simple reaction between copper nitrate and sodium hydroxide using a sonochemical-assisted method. The synthesized CuO was then characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared, ultraviolet-visible and photoluminescence spectroscopy. Our studies show that the CuO nanostructure can be used as a humidity sensor with a short response time (about 6 sec) and a long recovery time (up to 650 sec). Variation of relative sensor impedance (defined as sensing) at relative humidity of 90% was measured to be about 80, which indicates a high sensing of our designed sensor.


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